And they will be taking the opportunity to demand action over the promotion and protection of child rights.

Victoria Beckham’s husband has been working with the charity for nearly two decades, and – discussing why he decided to get involved – the 44-year-old explained: ‘Children everywhere dream of a better future.

‘I have worked with UNICEF for almost 20 years and I have met children in all corners of the world, young people that have ambitions for a better education, a life free from disease and for peace.

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‘All children deserve the opportunity to reach their potential and I’m very proud to support the young people speaking up for change today.’

David has worked with UNICEF for nearly 20 years (Picture: PA)

While Millie, 15, continued: ‘Young people my age are facing so many new challenges today that 30 years ago were hard to predict.

‘I’m proud to add my voice to all those around the world who are asking for solutions to today’s problems such as bullying, access to education, mental health awareness, suicide prevention and climate change.’

The teenager recently made headlines after opening up about being a role model to youngsters, and how it makes her consider her appearance more.

Millie came to fame thanks to her role as Eleven in Netflix sci-fi drama Stranger Things, alongside Finn Wolfhard and Noah Schnapp.

Millie opened up about being a role model to youngsters (Picture: FilmMagic)

‘I would really enjoy wearing more fitted clothes now,’ she said in the candid chat. ‘I feel like I’m becoming someone and being a woman so I just want to show that.’

Speaking about being a role model, she added: ‘I think about the girls who are going to look at the picture – those young girls that are going to look at me and if they think, “Wow that’s what I should dress up as”.

‘I want to make sure that I’m influencing being your age and being who you are in that time of your life.’

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